| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be required to [be] | 133 |
|
| 2 | be required to be | 133 |
|
| 3 | is required to [be] | 39 |
|
| 4 | are required to [be] | 34 |
|
| 5 | be required to [be] | 26 |
|
| 6 | were required to [be] | 17 |
|
| 7 | was required to [be] | 13 |
|
